Cables MCQs

Option A: sheath

Option B: insulator

Option C: surface of the conductor

Option D: core of the conductor

Correct Answer: core of the conductor ✔

Option A: the increase in length of the insulation

Option B: the decrease in the length of the insulation

Option C: either A. or (b)

Option D: none of the above

Correct Answer: the increase in length of the insulation ✔

Option A: Polyvinyle chloride

Option B: Vulcanised rubber

Option C: Impregnated paper

Option D: Compressed SFe gas

Correct Answer: Compressed SFe gas ✔

Option A: easy maintenance

Option B: low cost

Option C: can be used in congested areas

Option D: can be used in high voltage circuits

Correct Answer: can be used in congested areas ✔

Option A: use of dielectrics of different permeabilities

Option B: grading according to capacitance of cables per km length

Option C: cables using single dielectric in different concentrations

Option D: capacitance required to be introduced at different lengths to counter the effect of inductance

Correct Answer: use of dielectrics of different permeabilities ✔

Option A: hysteresis losses only

Option B: hysteresis and leakage losses only

Option C: hysteresis, leakage and copper losses only

Option D: hysteresis, leakage, copper and friction losses

Correct Answer: hysteresis and leakage losses only ✔

Option A: same at the conductor and the sheath

Option B: minimum at the conductor and maximum at the sheath

Option C: maximum at the conductor and minimum at the sheath

Option D: zero at the conductor as well as on the sheath

Correct Answer: maximum at the conductor and minimum at the sheath ✔

Option A: to minimise temperature stresses

Option B: to avoid being unearthed easily due to removal of soil

Option C: to minimize the effect of shocks and vibrations due to gassing vehicles, etc

Option D: for all of the above reasons

Correct Answer: to minimize the effect of shocks and vibrations due to gassing vehicles, etc ✔

Option A: 0.04 mm

Option B: 0.2 to 0.4 mm

Option C: 3 to 5 mm

Option D: 40 to 60 mm

Correct Answer: 0.04 mm ✔

Option A: presence of moisture

Option B: working temperature

Option C: time of application of the voltage

Option D: all of the above

Correct Answer: all of the above ✔

Option A: more perfect impregnation

Option B: smaller overall size

Option C: no ionisation, oxidation and formation of voids

Option D: all of the above

Correct Answer: all of the above ✔

Option A: annealed

Option B: hardened and tempered

Option C: hard drawn

Option D: alloy with chromium

Correct Answer: annealed ✔

Option A: mica insulated

Option B: paper insulated

Option C: compressed oil or compressed gas insulated

Option D: rubber insulated

Correct Answer: compressed oil or compressed gas insulated ✔

Option A: 2 cm

Option B: 10 cm

Option C: 50 cm

Option D: 400 cm

Correct Answer: 50 cm ✔

Option A: low permittivity

Option B: high resistivity

Option C: high dielectric strength

Option D: all of the above

Correct Answer: all of the above ✔

Option A: it is hygroscopic

Option B: it has high capacitance

Option C: it is an organic material

Option D: none of the above

Correct Answer: it is hygroscopic ✔

A. Yes
B. No

Correct Answer: Yes ✔

A. Yes
B. No

Correct Answer: No ✔

A. Yes
B. No

Correct Answer: Yes ✔

A. Yes
B. No

Correct Answer: No ✔

A. Yes
B. No

Correct Answer: ✔

A. Yes
B. No

Correct Answer: Yes ✔

A. Yes
B. No

Correct Answer: No ✔

Option A: becomes one-fourth

Option B: becomes one-half

Option C: becomes double

Option D: remains unchanged

Correct Answer: becomes double ✔

Option A: prevent the moisture from entering the cable

Option B: provide enough strength

Option C: provide proper insulation

Option D: none of the above

Correct Answer: prevent the moisture from entering the cable ✔

Option A: inter-sheaths

Option B: insulating materials with different dielectric constants

Option C: both (A) and (B)

Option D: none of the above

Correct Answer: both (A) and (B) ✔

Option A: minimize the stress

Option B: avoid the requirement of good insulation

Option C: provide proper stress distribution

Option D: none of the above

Correct Answer: provide proper stress distribution ✔

Option A: 5 kV/mm

Option B: 10 kV/mm

Option C: 15 kV/mm

Option D: 30 kV/mm

Correct Answer: 10 kV/mm ✔

Option A: lags the voltage by 90°

Option B: leads the voltage by 90°

Option C: lags the voltage by 180°

Option D: leads the voltage by 180°

Correct Answer: leads the voltage by 90° ✔

Option A: insulation may melt due to higher temperature

Option B: skin effect dominates on the conductor

Option C: of corona loss between conductor and sheath material

Option D: there is a danger of breakdown of insulation due to the presence of voids

Correct Answer: there is a danger of breakdown of insulation due to the presence of voids ✔

Option A: one half

Option B: double

Option C: four times

Option D: none of the above

Correct Answer: one half ✔

Option A: 11 kV

Option B: 33 kV

Option C: 66 kV

Option D: 132 kV

Correct Answer: 66 kV ✔

Option A: between 2 and 3

Option B: between 5 and 6

Option C: between 8 and 10

Option D: between 12 and 14

Correct Answer: between 2 and 3 ✔

Option A: steel tape

Option B: galvanised steel wire

Option C: any of the above

Option D: none of the above

Correct Answer: any of the above ✔

Option A: unsheathed cables

Option B: armoured

Option C: PVC sheathed cables

Option D: all of the above

Correct Answer: unsheathed cables ✔

Option A: polyvinyl chloride

Option B: post varnish conductor

Option C: pressed and varnished cloth

Option D: positive voltage conductor

Correct Answer: polyvinyl chloride ✔

Option A: composite

Option B: porous

Option C: homogeneous

Option D: hygroscopic

Correct Answer: composite ✔

Option A: 5 ohms

Option B: 20 ohms

Option C: 50 ohms

Option D: 100 ohms

Correct Answer: 50 ohms ✔

Option A: armour

Option B: bedding

Option C: conductor surface

Option D: lead sheath

Correct Answer: lead sheath ✔

Option A: the resistance of the conductor

Option B: the inductance of conductors

Option C: the capacitances of insulated conductors

Option D: all above parameters

Correct Answer: the capacitances of insulated conductors ✔

Option A: oil filled

Option B: S.L. type

Option C: belted

Option D: armoured

Correct Answer: oil filled ✔

Option A: 200 V

Option B: 500 V

Option C: 700 V

Option D: 1000 V

Correct Answer: 1000 V ✔

Option A: 11kV

Option B: 33kV

Option C: 66 kV

Option D: 132 kV

Correct Answer: 11kV ✔

Option A: 5 kV/mm

Option B: 15 kV/mm

Option C: 30 kV/mm

Option D: 200 kV/mm

Correct Answer: 30 kV/mm ✔

Option A: insulation layer

Option B: sheath

Option C: armour

Option D: conductor surface

Correct Answer: conductor surface ✔

Option A: blue

Option B: black

Option C: brown

Option D: none of the above

Correct Answer: blue ✔

Option A: avoid excessive sheath losses

Option B: make it flexible

Option C: either of the above

Option D: none of the above

Correct Answer: avoid excessive sheath losses ✔

Option A: be acid proof

Option B: be non-inflammable

Option C: be non-hygroscopic

Option D: have all above properties

Correct Answer: have all above properties ✔

Option A: absence of harmonics

Option B: non-existence of any stability limit

Option C: smaller dielectric loss

Option D: absence of ripples

Correct Answer: smaller dielectric loss ✔

Option A: High tension

Option B: Super tension

Option C: Extra high tension

Option D: Extra super voltage

Correct Answer: Extra super voltage ✔

Option A: hessian cloth

Option B: jute

Option C: any of the above

Option D: none of the above

Correct Answer: any of the above ✔

Option A: earthing connection

Option B: bedding

Option C: armouring

Option D: none of the above

Correct Answer: bedding ✔

Option A: varnished cambric

Option B: vulcanised rubber

Option C: impregnated paper

Option D: none of the above

Correct Answer: varnished cambric ✔

Option A: Bedding

Option B: Sheath

Option C: Armouring

Option D: None of the above

Correct Answer: Armouring ✔

Option A: low cost

Option B: high dielectric strength

Option C: high mechanical strength

Option D: all of the above

Correct Answer: all of the above ✔

Option A: reactive power

Option B: power factor

Option C: voltage

Option D: current carrying capacity

Correct Answer: voltage ✔

Option A: Varnished cambric

Option B: Rubber

Option C: Paper

Option D: Any of the above

Correct Answer: Any of the above ✔